linux-kernel - Re: [regression, bisected, pci/iommu] Bug 216865 - Black screen when amdgpu started during 6.2-rc1 boot with AMD IOMMU enabled

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Message-ID: <be2b2dfc-ed6c-f762-7e4c-9d22b13717fe@bell.net>
Date:   Tue, 10 Jan 2023 03:06:53 -0500
From:   Matt Fagnani <matt.fagnani@...l.net>
To:     Baolu Lu <baolu.lu@...ux.intel.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Vasant Hegde <vasant.hegde@....com>
Cc:     Thorsten Leemhuis <regressions@...mhuis.info>,
        Joerg Roedel <jroedel@...e.de>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        LKML <linux-kernel@...r.kernel.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [regression, bisected, pci/iommu] Bug 216865 - Black screen when amdgpu started during 6.2-rc1 boot with AMD IOMMU enabled

Baolu,

I tried to apply your patch after checking out 6.2-rc3 and origin/master 
but there were there the following errors.

git apply amd-iommu-amdgpu-boot-crash-2.patch
error: patch failed: drivers/pci/ats.c:382
error: drivers/pci/ats.c: patch does not apply

I manually changed drivers/pci/ats.c as shown in the patch. I built 
6.2-rc3 + the patch. 6.2-rc3 with the patch had the same black screen 
problem when booting. I added rd.driver.blacklist=amdgpu on the kernel 
command line to prevent amdgpu from being started while the initramfs 
was in use, and the black screen happened later in the boot as I 
described in my previous email. The journal showed the same two warnings 
and null pointer dereference which made amdgpu crash as I reported.

Thanks,

Matt